What function does the trigger serve in a firearm?

The trigger in a firearm is a critical component that initiates the firing process. When a shooter squeezes the trigger, it engages the firing mechanism, often releasing the firing pin or striker, which then impacts the cartridge's primer and ignites the propellant inside the bullet casing. This action is essential for discharging a bullet and is a vital part of firearm operation. Understanding the role of the trigger is crucial for safe handling and operation, as it directly relates to the shooter's control over when the firearm is fired. Proper training emphasizes the importance of trigger discipline to prevent accidental discharges and ensure responsible use of firearms.